Solid solution strengthening theories of high-entropy alloys

Abstract

We present a review of solid solution strengthening models for random concentrated solid solutions of which high entropy alloys are an interesting subset. High entropy alloys (HEAs) usually refer to a class of multicomponent alloys in equal or near equal concentrations. These complex compositions break the conventional notion of solutes and solvents. Few attempts have been made to extend the conventional solute strengthening models to HEAs. Among these, the model based on an average effective medium , does not include any adjustable parameter, allows all model inputs to be computed by atomistic simulations, and has predicted the strength of fcc HEAs in good agreement with experiments. The basic concepts of this theory is explained and its capabilities are compared with few other existing models for solute strengthening of HEAs. a CRL and MS made equal contributions to this work.

Fundamental electronic structure and multiatomic bonding in 13 biocompatible high-entropy alloys

“…Due to the complexity of their compositions and the difficulties for accurate measurements for comparison, most of these efforts are based on different perspectives and quite scattered. They generally used the random solid-solution-model (RSSM) to evaluate their properties although the methods employed could be very different [13][14][15] . Current theoretical methods for HEAs are spread out and include but not limited to the use of CALPHAD 1,12,16 , quasi-random-structure (SQS) [17][18][19] usually in the framework of density functional theory (DFT) on small-size supercells 20 , coherent potential approximations (EMTO-CPA) or effective medium theory 21,22 .…”

Hierarchical Microstructure of Laser Powder Bed Fusion Produced Face-Centered-Cubic-Structured Equiatomic CrFeNiMn Multicomponent Alloy

“…In recent years, the concept of manufacturing alloys with more than one or two principal elements has been considered to be promising to introduce innovations in alloys [ 1 , 2 ]. The multicomponent alloys, generally known as high-entropy alloys (HEAs), provide excellent properties beyond traditional metal alloys, including high strength [ 3 , 4 ], enhanced plasticity [ 5 ], oxidation resistance [ 6 ], wear resistance [ 7 ], and hydrogen storage ability [ 8 ]. Among the HEAs, the representative CoCrFeNiMn alloy has been the most widely studied [ 1 , 9 ].…”

Effect of Solution Treatment on the Shape Memory Functions of (TiZrHf)50Ni25Co10Cu15 High Entropy Shape Memory Alloy

“…In recent years, studies on HEAs have extended to non-equiatomic compositions for better desired or unique properties, such as light-weight [ 9 ], high phase stability [ 10 ], outstanding radiation resistance [ 11 ], etc. Assocaited with these newly explored properties, interpretations of fundamental mechanisms in HEAs have been investigated with both experimental and simulation techniques [ 12 , 13 , 14 , 15 , 16 ]. With the understanding of the atomic distribution and deformation mechanisms, the design and research progress of HEAs can step further [ 17 ].…”